Patents by Inventor Sudhanshu Gaur

Sudhanshu Gaur has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20110158151
    Abstract: A system comprises a communication engine for transmitting at least one groupcast packet to wireless stations on a wireless network; an ACK leader selection engine for identifying at least one of the wireless stations as a current ACK leader responsible for generating any ACK in response to the at least one groupcast packet, and for shifting the current ACK leader among a group of the wireless stations; and an ACK management engine for managing any ACK received from the current ACK leader.
    Type: Application
    Filed: March 4, 2011
    Publication date: June 30, 2011
    Applicant: HITACHI, LTD.
    Inventor: Sudhanshu Gaur
  • Publication number: 20110134865
    Abstract: A system comprises a candidate channel assessment module for obtaining at least one AC-specific channel suitability metric for each of two different channels, and for using the AC-specific channel suitability metrics to determine a channel suitability index of each of the two different channels; a channel selection module for using the channel suitability index to select one of the two different channels as a new channel; and a channel setting module for configuring a wireless transceiver to use the new channel.
    Type: Application
    Filed: February 10, 2011
    Publication date: June 9, 2011
    Applicant: Hitachi, Ltd.
    Inventor: Sudhanshu Gaur
  • Patent number: 7920497
    Abstract: A system comprises a communication engine for transmitting at least one groupcast packet to wireless stations on a wireless network; an ACK leader selection engine for identifying at least one of the wireless stations as a current ACK leader responsible for generating any ACK in response to the at least one groupcast packet, and for shifting the current ACK leader among a group of the wireless stations; and an ACK management engine for managing any ACK received from the current ACK leader.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: April 5, 2011
    Assignee: Hitachi, Ltd.
    Inventor: Sudhanshu Gaur
  • Patent number: 7912002
    Abstract: A system comprises a candidate channel assessment module for obtaining at least one AC-specific channel suitability metric for each of two different channels, and for using the AC-specific channel suitability metrics to determine a channel suitability index of each of the two different channels; a channel selection module for using the channel suitability index to select one of the two different channels as a new channel; and a channel setting module for configuring a wireless transceiver to use the new channel.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: March 22, 2011
    Assignee: Hitachi, Ltd.
    Inventor: Sudhanshu Gaur
  • Publication number: 20110058598
    Abstract: To realize a GDFE precoder for multi-user MIMO systems, which significantly reduces the computational cost while resulting in no capacity loss, one method comprises computing an effective UL channel matrix HUL using one of two methods HUL=HDLH, or HUL=[(Pt/Nt)HDLHHDL+I]?1/2HDLH; extracting Hk from HUL; computing a singular value decomposition of the DL channel between the BS and kth UT, Hk, for all K UTs, Hk=UkSkVkH; extracting all singular values as s=[diag(S1), . . . , diag(SK)]; extracting a vector ? from s by choosing first utmost Nt largest non-zero singular values of s; sorting elements in ? in decreasing order; performing water-filling to allocate power and obtain a diagonal matrix ?k representing power allocations corresponding to the singular values of the kth UT; computing an UL covariance matrix for each UT as ?k=Uk?kUkH; and obtaining an overall input covariance matrix D for the equivalent UL channel.
    Type: Application
    Filed: September 4, 2009
    Publication date: March 10, 2011
    Applicant: HITACHI, LTD.
    Inventor: Sudhanshu Gaur
  • Publication number: 20110058599
    Abstract: To realize a GDFE precoder for multi-user MIMO systems, which significantly reduces the computational cost while resulting in no capacity loss, one method comprises obtaining an effective downlink (DL) channel matrix H for the DL channel after receiver processing at the user terminals; computing an uplink (UL) covariance matrix D by assuming there are as many user terminals as a number of rows in the effective DL channel matrix H; computing a filter matrix C based on the UL covariance matrix D; computing a feedforward filter matrix F based on the filter matrix C; computing an interference pre-cancellation matrix G, based on the feedforward filter matrix F and the filter matrix C, used in a transmitter at an interference pre-cancellation stage of the GDFE precoder; and processing user symbols by a decision feedback equalizing stage of the GDFE precoder to produce filtered vector symbols.
    Type: Application
    Filed: September 4, 2009
    Publication date: March 10, 2011
    Applicant: HITACHI, LTD.
    Inventor: Sudhanshu GAUR
  • Patent number: 7873049
    Abstract: A system comprises a station manager for associating a queue block to each active station in a network, each queue block being configured to implement a contention-based process, e.g., IEEE 802.11e, to select a winning frame from a set of frames; a multiplexer for receiving frames, each frame having a destination address, and for routing each received frame to a queue block based on the destination address; an access controller for receiving the winning frame from each queue block, for forwarding the winning frame(s) to a physical layer for simultaneous transmission to the active station(s) when the number of winning frames is equal to or below a threshold greater than one, and for forwarding a subset of the winning frames to the physical layer for simultaneous transmission to the active stations when the number of winning frames is above the threshold; and a physical layer capable of simultaneous frame transmission.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: January 18, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Sudhanshu Gaur, Clifford Tavares
  • Patent number: 7801104
    Abstract: A system (e.g., an AP or a STA) in a WLAN comprises slot information (e.g., slot association or slot bias information); a counter for counting slot numbers; and a medium access controller operative to monitor a wireless medium and to initiate transmission of a MAC frame during a current slot based an a distributed wireless access protocol (e.g., DCF or EDCA), on a current slot number (t) corresponding to the current slot as counted by the counter, and on the slot information. The medium access controller may initiate frame transmission when a backoff counter is zero and when t mod N=ni (such that N=number of STAs, and ni=assigned slot number). Alternatively, the medium access controller may initiate frame transmission when a backoff counter is zero and when a slot bias mechanism effecting a probability of access to the wireless medium is satisfied.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: September 21, 2010
    Assignee: Hitachi, Ltd.
    Inventor: Sudhanshu Gaur
  • Publication number: 20100232494
    Abstract: A technique is used to realize a generalized decision feedback equalizer (GDFE) Precoder for multi-user multiple-input multiple-output (MU-MIMO) systems, which significantly reduces the computational cost while resulting in no capacity loss. The technique is suitable for improving the performance of various MU-MIMO wireless systems including future 4G cellular networks. In one embodiment, a method for configuring a GDFE precoder in a base station of a MU-MIMO wireless system having k user terminals, each user terminal having associated therewith a feedforward filter. The method comprises computing a filter matrix C using one of a plurality of alternative formulas of the invention; and, based on the computation of the filter matrix C, computing a transmit filter matrix B for a transmit filter used to process a symbol vector obtained after a decision feedback equalizing stage of the GDFE precoder, a feedforward filter matrix F, and an interference pre-cancellation matrix G.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 16, 2010
    Inventor: Sudhanshu Gaur
  • Patent number: 7684430
    Abstract: A method comprises receiving by a MAC layer of a content server a transmission frame from an upper layer of the content server, the transmission frame being associated with a given access class of multiple access classes, the given access class being associated with a primary priority level, the transmission frame including content being associated with a secondary priority level; setting MAC layer parameter values based on the primary priority level, a given one of the MAC layer parameter values being based on the primary and secondary priority levels; and contending for access to a wireless medium using the MAC layer parameter values. The given one of the MAC layer parameter values may include AIFS, CWmax, CWmin, or TXOP. The method may further comprise generating the transmission frame by a hierarchically divided encryption protocol, e.g., MPEG, being resident in at least one of the upper layers of the content server.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: March 23, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Sudhanshu Gaur, Karthik Channakeshava
  • Publication number: 20100017530
    Abstract: Priority-based physical layer transmission rate control for video streaming over wireless networks comprises receiving a video packet comprising at least part of a video frame. The video frame includes multiple slices, and each of the slices includes multiple macroblocks of a particular type. A current physical layer transmission bit rate is determined based at least in part on (1) a relative importance of the packet with respect to its impact on video quality and (2) a number of retransmissions of the packet at a previous physical layer transmission bit rate. The packet is transmitted at the current physical layer transmission bit rate.
    Type: Application
    Filed: June 23, 2008
    Publication date: January 21, 2010
    Applicant: Hitachi, Ltd.
    Inventor: Sudhanshu Gaur
  • Publication number: 20090175251
    Abstract: A media center system comprises a first wireless controller operative to communicate with a first set of devices on a first WLAN using a first wireless standard; a first network processor coupled to the first wireless controller and operative to establish wireless communication over a first channel with the first set of devices on the first WLAN; a second wireless controller operative to communicate with a second set of devices on a second WLAN using a second wireless standard, the second wireless controller substantially dedicated for multimedia content delivery; and a second network processor coupled to the second wireless controller and operative to establish wireless communication over a second channel with the second set of devices on the second WLAN, the second channel being different than the first channel.
    Type: Application
    Filed: January 4, 2008
    Publication date: July 9, 2009
    Inventors: Brian Litzinger, Sudhanshu Gaur, John Simons, Qing Li
  • Publication number: 20090109904
    Abstract: A system comprises a medium access engine operative to contend for access to a channel and to control transmission of data packets onto the channel on behalf of a particular data stream, the particular data stream belonging to a particular access class of a plurality of different access classes, the medium access engine operative to discriminate quality of service based on the different access classes; and a burst channel access engine operative to maintain a burst list of other data streams belonging to the particular access class and to control burst access to the channel based on the burst list on behalf of the particular data stream.
    Type: Application
    Filed: October 24, 2007
    Publication date: April 30, 2009
    Inventor: Sudhanshu Gaur
  • Publication number: 20090046613
    Abstract: A system comprises a communication engine for transmitting at least one groupcast packet to wireless stations on a wireless network; an ACK leader selection engine for identifying at least one of the wireless stations as a current ACK leader responsible for generating any ACK in response to the at least one groupcast packet, and for shifting the current ACK leader among a group of the wireless stations; and an ACK management engine for managing any ACK received from the current ACK leader.
    Type: Application
    Filed: August 15, 2007
    Publication date: February 19, 2009
    Inventor: Sudhanshu Gaur
  • Publication number: 20080279140
    Abstract: A system comprises a candidate channel assessment module for obtaining at least one AC-specific channel suitability metric for each of two different channels, and for using the AC-specific channel suitability metrics to determine a channel suitability index of each of the two different channels; a channel selection module for using the channel suitability index to select one of the two different channels as a new channel; and a channel setting module for configuring a wireless transceiver to use the new channel.
    Type: Application
    Filed: May 7, 2007
    Publication date: November 13, 2008
    Inventor: Sudhanshu Gaur
  • Publication number: 20080240049
    Abstract: A system comprises a monitoring module operative to monitor traffic on a wireless medium, the traffic belonging to one or more of two different access classes (ACs), one access class (AC) being a higher-priority AC and the other being a lower-priority AC; a throughput adaptation module communicatively coupled to the monitoring module and operative to dynamically generate data corresponding to one or more AC-sensitive parameters based on the monitored traffic and on a desired throughput ratio between the two different ACs; and a wireless communication module communicatively coupled to the throughput adaptation module and operative to communicate the data to one or more wireless stations on the wireless medium.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 2, 2008
    Inventor: Sudhanshu Gaur
  • Publication number: 20080101308
    Abstract: A system (e.g., an AP or a STA) in a WLAN comprises slot information (e.g., slot association or slot bias information); a counter for counting slot numbers; and a medium access controller operative to monitor a wireless medium and to initiate transmission of a MAC frame during a current slot based on a distributed wireless access protocol (e.g., DCF or EDCA), on a current slot number (t) corresponding to the current slot as counted by the counter, and on the slot information. The medium access controller may initiate frame transmission when a backoff counter is zero and when t mod N=ni (such that N=number of STAs, and ni=assigned slot number). Alternatively, the medium access controller may initiate frame transmission when a backoff counter is zero and when a slot bias mechanism effecting a probability of access to the wireless medium is satisfied.
    Type: Application
    Filed: October 26, 2006
    Publication date: May 1, 2008
    Inventor: Sudhanshu Gaur
  • Publication number: 20080056297
    Abstract: A method comprises receiving by a MAC layer of a content server a transmission frame from an upper layer of the content server, the transmission frame being associated with a given access class of multiple access classes, the given access class being associated with a primary priority level, the transmission frame including content being associated with a secondary priority level; setting MAC layer parameter values based on the primary priority level, a given one of the MAC layer parameter values being based on the primary and secondary priority levels; and contending for access to a wireless medium using the MAC layer parameter values. The given one of the MAC layer parameter values may include AIFS, CWmax, CWmin, or TXOP. The method may further comprise generating the transmission frame by a hierarchically divided encryption protocol, e.g., MPEG, being resident in at least one of the upper layers of the content server.
    Type: Application
    Filed: September 6, 2006
    Publication date: March 6, 2008
    Inventors: Sudhanshu Gaur, Karthik Channakeshava
  • Publication number: 20080002636
    Abstract: A system comprises a station manager for associating a queue block to each active station in a network, each queue block being configured to implement a contention-based process, e.g., IEEE 802.11e, to select a winning frame from a set of frames; a multiplexer for receiving frames, each frame having a destination address, and for routing each received frame to a queue block based on the destination address; an access controller for receiving the winning frame from each queue block, for forwarding the winning frame(s) to a physical layer for simultaneous transmission to the active station(s) when the number of winning frames is equal to or below a threshold greater than one, and for forwarding a subset of the winning frames to the physical layer for simultaneous transmission to the active stations when the number of winning frames is above the threshold; and a physical layer capable of simultaneous frame transmission.
    Type: Application
    Filed: June 28, 2006
    Publication date: January 3, 2008
    Inventors: Sudhanshu Gaur, Clifford Tavares
  • Publication number: 20070165665
    Abstract: A method comprises obtaining a frame of information in an access class to be communicated over a wireless channel; determining whether the wireless channel is idle; selecting a random arbitration interframe space based on the access class of the frame; waiting a first time period pertaining to the arbitration interface space; and initiating communication of the frame of information over the wireless channel after the first time period. The method may further comprise, before initiating communication of the frame of information, selecting a random backoff time period and waiting a second time period pertaining to the backoff time period. The random arbitration interframe space may be selected from a predetermined set of values. The number of values in the predetermined set may be associated with the number of possible stations transmitting in the access class.
    Type: Application
    Filed: January 13, 2006
    Publication date: July 19, 2007
    Inventors: Sudhanshu Gaur, Clifford Tavares